refactoring TimeSeriesMapLoader; refactoring corporate action loader; adding Date.today_datestamp; adding convenience method to Stats module; adding SecurityClassificationLoader and FindSecurityClassification; updating CSI Data importer; adding migrations; updating data model in line with new migrations

bringing some changes from a private branch back into master

clarifying why the time_series association on the FundamentalDataset model is a many_to_one

fixing bug in csi data importer

replacing sector and industry relations with new classification relation; swapped out all code referencing the old sector and industry relations with code to deal with classifications.

adding migration to replace sector and industry relations with a new classification relation

adding logic to quandl_time_series_importer.rb to handle network drops

removing debug line from import script

changing EOD bar importer to import dividend amount

adding migration to add field to corporate_actions table

Merging a portion of a private branch back into master

Merge branch 'master' into private

finished split and dividend adjustment to price and volume figures; both types of adjustment work

adjusting stock prices for splits and dividends now works

refactoring stuff